CN112564586A - Current protection control method, device, equipment and storage medium of motor - Google Patents
Current protection control method, device, equipment and storage medium of motor Download PDFInfo
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- CN112564586A CN112564586A CN202011380224.1A CN202011380224A CN112564586A CN 112564586 A CN112564586 A CN 112564586A CN 202011380224 A CN202011380224 A CN 202011380224A CN 112564586 A CN112564586 A CN 112564586A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/10—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors for preventing overspeed or under speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/20—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors for controlling one motor used for different sequential operations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/40—Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The invention discloses a current protection control method, a current protection control device, current protection equipment and a storage medium of a motor. The control method comprises the following steps: acquiring the operating current of the motor; acquiring a rotating speed gear at which the motor operates; determining a current protection value of the motor based on the rotation speed gear; performing protection control on the motor based on a comparison result of the working current and the current protection value; the motor comprises at least two rotating speed gears, the current protection value is arranged corresponding to the rotating speed gears, and the current protection value is reduced along with the reduction of the rotating speed of the motor. The response speed of the motor current protection under different rotating speed gears can be effectively improved, especially the current protection time delay of the motor under low rotating speed is reduced, and the reliability of the motor operation is favorably improved.
Description
Technical Field
The present invention relates to the field of motor control, and in particular, to a current protection control method, apparatus, device, and storage medium for a motor.
Background
An air conditioner generally has one or more motors, which are responsible for fresh air, execution of a movement mechanism and the like, and the motors are often provided with various protections on a control circuit due to reliability requirements, such as voltage protection, current protection, reverse protection, short-circuit protection and the like.
For current protection, a current protection value Ie is usually set for the motor, and in the running process of the motor, if the detected working current is greater than the current protection value Ie, the current protection is performed on the motor, for example, the output power of the motor is limited or the motor is stopped. The current protection mode is often difficult to timely and effectively protect the current of the motor.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, an apparatus, a device, and a storage medium for controlling current protection of a motor, which aim to improve response speed of current protection of the motor.
The technical scheme of the embodiment of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a current protection control method for a motor, including:
acquiring the operating current of the motor;
acquiring a rotating speed gear at which the motor operates;
determining a current protection value of the motor based on the rotation speed gear;
performing protection control on the motor based on a comparison result of the working current and the current protection value;
the motor comprises at least two rotating speed gears, the current protection value is arranged corresponding to the rotating speed gears, and the current protection value is reduced along with the reduction of the rotating speed of the motor.
In a second aspect, an embodiment of the present invention further provides a current protection control method for a motor, including:
controlling the motor to operate at a specified rotating speed gear;
selecting a resistance branch of a multi-path sampling circuit based on the rotating speed gear;
acquiring sampling voltage which is generated by the gated resistance branch circuit and reflects the working current of the motor at the rotating speed gear;
based on the comparison result of the sampling voltage and a preset voltage protection value, performing protection control on the motor;
the motor comprises at least two rotating speed gears, the multi-path sampling circuit comprises at least two resistance branches, the resistance value of the gated resistance branch corresponds to the rotating speed gears, and the resistance value of the gated resistance branch is increased along with the reduction of the rotating speed of the motor.
In a third aspect, an embodiment of the present invention further provides a current protection control device for a motor, including:
the acquisition module is used for acquiring the working current of the motor and the rotating speed gear of the motor;
the determining module is used for determining a current protection value of the motor based on the rotating speed gear;
the first protection control module is used for carrying out protection control on the motor based on a comparison result of the working current and the current protection value;
the motor comprises at least two rotating speed gears, the current protection value is arranged corresponding to the rotating speed gears, and the current protection value is reduced along with the reduction of the rotating speed of the motor.
In a fourth aspect, an embodiment of the present invention further provides a current protection control device for a motor, including:
the gear control module is used for controlling the motor to operate at a specified rotating speed gear;
the gating module is used for gating the resistance branches of the multi-path sampling circuit based on the rotating speed gear;
the sampling module is used for acquiring sampling voltage which is generated by the gated resistance branch and reflects the working current of the motor at the rotating speed gear;
the second protection control module is used for carrying out protection control on the motor based on a comparison result of the sampling voltage and a preset voltage protection value;
the motor comprises at least two rotating speed gears, the multi-path sampling circuit comprises at least two resistance branches, the resistance value of the gated resistance branch corresponds to the rotating speed gears, and the resistance value of the gated resistance branch is increased along with the reduction of the rotating speed of the motor.
In a fifth aspect, an embodiment of the present invention further provides a current protection control apparatus for a motor, including: a processor and a memory for storing a computer program operable on the processor, wherein the processor, when executing the computer program, is adapted to perform the steps of the method according to the first aspect of an embodiment of the present invention.
In a sixth aspect, an embodiment of the present invention further provides a current protection control device for a motor, including: a processor and a memory for storing a computer program operable on the processor, wherein the processor, when executing the computer program, is adapted to perform the steps of the method according to the second aspect of the embodiment of the present invention.
In a seventh aspect, an embodiment of the present invention further provides an air conditioner, including: a motor; and the current protection control device according to the embodiment of the invention.
In an eighth aspect, an embodiment of the present invention further provides a storage medium, where the storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps of the method according to any embodiment of the present invention.
According to the technical scheme provided by the embodiment of the invention, the working current of the motor and the rotating speed gear at which the motor operates are obtained, and the current protection value of the motor is determined based on the rotating speed gear, so that the determined current protection value of the motor can change along with the change of the rotating speed gear.
According to the technical scheme provided by the embodiment of the invention, the motor is controlled to operate at a specified rotating speed gear, and the resistance branch of the multi-path sampling circuit is gated based on the rotating speed gear; acquiring sampling voltage which is generated by the gated resistance branch circuit and reflects the working current of the motor at the rotating speed gear; the resistance value of the gated resistance branch is increased along with the reduction of the rotating speed of the motor, so that the sampling voltage with low rotating speed can quickly reach a voltage protection value, the response speed of motor current protection under different rotating speed gears can be effectively improved, the current protection time delay of the motor under low rotating speed is particularly reduced, and the reliability of the motor operation is favorably improved.
Drawings
Fig. 1 is a schematic diagram illustrating a response time delay of current protection based on a current protection value in the related art;
fig. 2 is a schematic flow chart of a current protection control method for a motor according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating response time delays for current protection based on a plurality of current protection values according to an exemplary embodiment of the present invention;
FIG. 4 is one of the fan circuit diagrams of an on-hook indoor unit of an air conditioner according to an exemplary embodiment of the present invention;
FIG. 5 is a schematic diagram of an operating waveform of an operating current of an exemplary motor according to the present invention;
FIG. 6 is a diagram illustrating response time delay of current protection based on voltage protection value in the related art;
fig. 7 is a second flowchart illustrating a current protection control method for a motor according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a current protection control system for an exemplary motor embodying the present invention;
FIG. 9 is a diagram illustrating response time delay of current protection based on voltage protection value according to an exemplary embodiment of the present invention;
FIG. 10 is a second circuit diagram of a fan of an on-hook air conditioner according to an exemplary embodiment of the present invention;
fig. 11 is a schematic structural diagram of a current protection control device of a motor according to an embodiment of the present invention;
fig. 12 is a second schematic structural diagram of a current protection control device of a motor according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a current protection control device of a motor according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the related art, the motor usually performs current protection based on a current protection value, that is, the current protection value is fixed, and this method results in different time delays of current protection in different rotational speed gears, especially in low rotational speed gears, if the motor fails, the response speed of current protection is slow, and under severe conditions, current protection fails.
For example, as shown in fig. 1, for the design of reliability, the motor sets a current protection value Ie, the motor has a high speed gear, a medium speed gear and a low speed gear, when the motor fails, the time delay of the current protection of the motor operating in different speed gears is different, specifically, the response time of the current protection of the motor under the high speed normal operation is T1, the response time of the current protection of the motor under the medium speed normal operation is T1+ T2, and the response time of the current protection of the motor under the low speed normal operation is T1+ T2+ T3.
Based on this, the various embodiments of the invention aim to effectively improve the response speed of the motor current protection under different rotating speed gears, thereby improving the reliability of the motor operation.
As shown in fig. 2, an embodiment of the present invention provides a current protection control method for a motor, which can be applied to a controller, and includes:
here, the motor may be a direct current motor, such as a single-phase brush direct current motor or a three-phase brushless direct current motor. The controller may obtain the working current collected by the sampling circuit, for example, the sampling circuit may be a sampling resistor disposed on a power supply circuit of the motor.
here, the motor includes at least two speed steps, and the controller may identify the speed step in which the motor operates based on the control command.
here, the current protection value is set corresponding to the rotation speed step, and the current protection value is decreased as the rotation speed of the motor is decreased. The controller may pre-store a mapping relationship between the current protection value and the rotational speed gear, so as to determine the current protection value based on the rotational speed gear at which the motor is currently operated.
And 204, performing protection control on the motor based on a comparison result of the working current and the current protection value.
In the embodiment of the invention, the determined current protection value of the motor can change along with the change of the rotating speed gear, so that the traditional mode of fixing the current protection value is changed, the current protection value is reduced along with the reduction of the rotating speed of the motor, the response speed of the motor current protection under different rotating speed gears can be effectively improved, the current protection time delay of the motor under low rotating speed is particularly reduced, and the reliability of the motor operation is favorably improved.
In some embodiments, the motor is a fan motor for an air conditioner, the fan motor is a low-voltage direct-current motor, for example, a low-voltage motor such as 24V, 36V or 48V, and can be powered by a switching power supply, because the output power of the switching power supply is limited, by setting different rotation speed gears for the motor, the power supply requirements of different other loads can be met under the scene of constant power output of the switching power supply, for example, by setting the motor to operate at a low rotation speed gear, more other loads can be operated. According to the current protection control method, under a low-rotation-speed gear, if abnormal operation such as blocking of the motor occurs, the motor can be controlled to stop operating in time, and therefore power supply influence of a power supply circuit on other loads is avoided.
Illustratively, the performing protection control on the motor based on the comparison result of the working current and the current protection value in step 204 includes:
and determining that the working current is greater than or equal to the current protection value, and controlling the output power of the motor to be less than or equal to the set power or controlling the motor to stop running.
The protection power value of the motor under the current rotating speed gear is set, so that the current protection value of the motor corresponding to the high rotating speed gear is high, the current protection value corresponding to the low rotating speed gear is low, the quick response of the current protection of the motor under different load conditions can be realized, the motor fault can be protected in time, the current protection of the fault is quicker particularly when the rotating speed gear is low, and the running reliability of the motor is improved.
As shown in fig. 3, the motor includes n-speed gears, n is a natural number greater than 2, and accordingly, the current protection value includes: and each current protection value corresponds to each rotating speed gear, and the current protection value is reduced along with the reduction of the rotating speed of the motor, when the motor breaks down, the time delay of the current protection of the motor running under different rotating speed gears can be unified based on the reasonably set current protection value, for example, the protection time duration (namely the response time delay of the current protection) under different rotating speed gears is T1.
In one application example, the current protection control method of the motor comprises the following steps:
1) the controller sets current protection values of various rotating speed gears of different motors, such as Ie1 and Ie2 … Ien;
2) the controller controls the rotating speed of the motor to operate at corresponding rotating speed gears according to the requirements of program control, such as F1, F2 … Fn;
3) the controller determines a corresponding current protection value I based on different motor rotating speeds F, for example, the rotating speed F1 corresponds to Ie1, the rotating speed F2 corresponds to Ie2, and so on;
4) and when the controller detects that the working current Id under the current rotating speed setting is larger than the set current protection value I, the power output of the motor is limited or the motor is directly closed, and meanwhile, a corresponding protection function is performed.
Therefore, the motor can be rapidly protected under different load conditions, current protection can be timely carried out when the motor fails, particularly, the motor can respond more quickly when the motor fails at a low rotating speed, and the running reliability of the motor is improved.
Exemplarily, the electric machine comprises a first speed gear, a second speed gear and a third speed gear, wherein the running speeds of the first speed gear, the second speed gear and the third speed gear are gradually increased, and the current protection value comprises: a first current protection value corresponding to the first rotational speed gear, a second current protection value corresponding to the second rotational speed gear, and a third current protection value corresponding to the third rotational speed gear, where the first current protection value is smaller than the second current protection value and the second current protection value is smaller than the third current protection value, and protection control is performed on the motor based on a comparison result between the working current and the current protection value, including:
if the motor runs in the first rotating speed gear, determining that the working current is greater than or equal to the first current protection value, and controlling the output power of the motor not to exceed a first power value; alternatively, the first and second electrodes may be,
if the motor runs in the second rotating speed gear, determining that the working current is greater than or equal to the second current protection value, and controlling the output power of the motor not to exceed a second power value; alternatively, the first and second electrodes may be,
if the motor runs at the third rotating speed gear, determining that the working current is greater than or equal to the third current protection value, and controlling the output power of the motor not to exceed a third power value or controlling the motor to stop running;
wherein the first power value is less than the second power value, and the second power value is less than the third power value.
Fig. 4 shows a circuit diagram of a fan of an on-hook indoor unit of an air conditioner in an application example, and the circuit comprises: the air conditioner master control system, three-phase direct current motor M1 and 3 sampling resistors R1-R3. The air conditioner main control system can be a single chip microcomputer system, namely the controller, functions such as rotating speed control and protection control of the three-phase direct current motor M1 are achieved, 3 sampling resistors (equivalent to the sampling circuit) can monitor the working current of the three-phase direct current motor M1 in real time, and in actual use, the air conditioner main control system can provide 3-gear rotating speed and is divided into three gears, namely high gear, medium gear and low gear. In use, since the rotation speed of the motor is a slow rising process, the response time of the motor is usually 2-20 seconds or even longer. The specific operation process of the air conditioner master control system is as follows:
1) the air conditioner master control system respectively sets a high-wind current protection value corresponding to Ie1, a medium-wind current protection value corresponding to Ie2 and a low-wind current protection value corresponding to Ie 3.
2) And when the air conditioner executes a high wind gear and the load is overlarge, and the detected working current is greater than Ie1, the air conditioner main control system executes a current protection action under the high wind gear, stops the operation of the air conditioner and reports the fault of the fan.
3) And when the air conditioner executes the medium wind gear, the load is overlarge at the same time, and the detected working current is larger than Ie2, the air conditioner main control system executes the current protection action under the medium wind gear, limits the output power, keeps outputting the maximum Ie2 current output power, and the fan operates according to Ie2 current output power.
4) And when the air conditioner executes a low wind gear and simultaneously the load is overlarge, and the detected working current is larger than Ie3, the air conditioner main control system executes a current protection action under the low wind gear, limits the output power, keeps outputting the maximum Ie3 current output power, and the fan operates according to Ie3 current output power.
Illustratively, the operating waveform of the operating current of the motor is as shown in fig. 5. In this example, the air conditioner control system ensures that the protection of the fans can be performed within a response time delay T1 (for example, 5 seconds) at different rotation speeds by controlling different protection currents at different fan gears.
In the related art, the motor usually performs current protection based on a current protection value, in actual use, 1 resistor R may be adopted, the motor working current flows through the resistor R, and through the electrical characteristics, U ═ I × R, the control system samples the voltage value on the resistor, and then the current motor working current may be converted, and current protection may be performed on the motor based on the sampled voltage value, for example, when the current is too large, the output power of the motor is limited or the motor is stopped to work.
For example, as shown in fig. 6, for a reliable design, the motor sets a voltage protection value Ue, the motor has a high speed gear, a medium speed gear and a low speed gear, when the motor fails, the time delay of the current protection of the motor operating in different speed gears is different, specifically, the response time of the current protection of the motor under the high speed normal operation is T1, the response time of the current protection of the motor under the medium speed normal operation is T1+ T2, and the response time of the current protection of the motor under the low speed normal operation is T1+ T2+ T3. Obviously, in a low-speed gear, if the motor fails, the response speed of current protection is slow, and under severe conditions, current protection fails.
As shown in fig. 7, an embodiment of the present invention provides a current protection control method for a motor, which can be applied to a controller, and includes:
here, the motor may be a dc motor, and the controller may control the motor to operate at a designated speed based on a control demand.
here, the controller gates the resistance branch of the multi-path sampling circuit based on the rotating speed gear of the motor operation to obtain the sampling voltage of the motor. The motor includes two at least rotational speed gears, multichannel sampling circuit includes two at least resistance branch roads, the resistance value of the resistance branch road of gating with the rotational speed gear corresponds, just the resistance value of the resistance branch road of gating is along with the reduction of the rotational speed of motor increases.
and 704, performing protection control on the motor based on a comparison result of the sampling voltage and a preset voltage protection value.
In the embodiment of the invention, the resistance value of the gated resistance branch increases along with the reduction of the rotating speed of the motor, so that the sampling voltage with low rotating speed can quickly reach a voltage protection value, the response speed of the motor current protection under different rotating speed gears can be effectively improved, the current protection time delay of the motor under low rotating speed is particularly reduced, and the reliability of the motor operation is favorably improved.
Illustratively, in step 704, the performing protection control on the motor based on the comparison result of the sampled voltage and a preset voltage protection value includes:
and determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor to be less than or equal to the set power or controlling the motor to stop running.
The power is set, namely the protection power value of the motor at the current rotating speed gear, so that the resistance value of the multi-path sampling circuit corresponding to the low rotating speed gear of the motor is high, the sampling voltage for reflecting the working current of the motor can rise quickly, the quick response of the current protection of the motor under different load conditions can be realized, the motor fault can be protected timely, the current protection of the motor which breaks down is quicker particularly at the low rotating speed gear, and the reliability of the motor operation is improved.
As shown in fig. 8, the current protection control system of the motor includes: motor, controller and multichannel sampling circuit, wherein, multichannel sampling circuit includes: at least two resistance branches, the controller includes: the multi-path sampling circuit comprises a gating port and a sampling port used for acquiring sampling voltage, wherein each resistance branch in the multi-path sampling circuit is respectively arranged corresponding to the gating port and is communicated to the corresponding gating port through a switching tube, and the switching tube determines whether the resistance branch is communicated to the sampling port or not under the control of the gating port. As shown in fig. 8, each branch of the multi-path sampling circuit where each resistor is located is provided with a MOS (metal oxide semiconductor, metal-oxide semiconductor) tube, each MOS tube is connected to the sampling port IOin in a converged manner, each MOS tube is connected to a corresponding gating port (e.g., IO1, IO2 … IOn shown in fig. 8), and whether the resistor branch is gated is determined by the port voltage of the corresponding gating port, so that the magnitude of the resistance value of the multi-path sampling circuit can be adjusted based on the gating control of the resistor branch in the multi-path sampling circuit, and the change slope of the sampling voltage following the working current of the motor is further adjusted, so as to achieve the effect of reducing the response delay of the current protection at the low-speed gear.
As shown in fig. 9, the motor includes n speed gears, where n is a natural number greater than 2, and accordingly, the multi-path sampling circuit may generate sampling voltages corresponding to different resistance values (i.e., change slopes) under gating control of the controller, and the resistance values correspond to the speed gears one to one, and the resistance values increase with the decrease of the motor speed, and when the motor fails, based on a reasonably set voltage protection value, time delays of current protection of the motor operating at different speed gears may be uniform, for example, protection durations (i.e., response delays of current protection) at different speed gears are all T1.
In one application example, the current protection control method of the motor comprises the following steps:
1) the controller sets a voltage protection value Ue as a comparison reference of a sampling voltage (voltage at the sampling port IOin);
2) the controller controls the rotating speed of the motor to operate at corresponding rotating speed gears according to the requirements of program control, such as F1, F2 … Fn;
3) the controller sets a multi-path sampling circuit to gate different resistors R according to different motor rotating speeds F, for example, the rotating speed F1 corresponds to R1, F2 corresponds to R2, and the like;
4) when the AD sampling port IOin of the controller detects that the voltage U exceeds a set voltage protection value Ue, the motor protection processing is carried out;
5) and the controller performs a corresponding protection function according to the current motor rotating speed.
Therefore, the motor can be rapidly protected under different load conditions, current protection can be timely carried out when the motor fails, particularly, the motor can respond more quickly when the motor fails at a low rotating speed, and the running reliability of the motor is improved.
Exemplarily, the motor includes a first speed gear, a second speed gear and a third speed gear with gradually increasing operating speeds, and the resistance value of the gated resistance branch includes: with first resistance value that first rotational speed gear corresponds, with second resistance value that second rotational speed gear corresponds and with the third resistance value that third rotational speed gear corresponds, first resistance value is greater than the second resistance value and the second resistance value is greater than the third resistance value, based on the comparison result of sampling voltage and predetermined voltage protection value, right the motor carries out protection control, include:
if the motor runs in the first speed gear, determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor not to exceed a first power value; alternatively, the first and second electrodes may be,
if the motor runs in the second rotating speed gear, determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor not to exceed a second power value; alternatively, the first and second electrodes may be,
if the motor runs at the third rotating speed gear, determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor not to exceed a third power value or controlling the motor to stop running;
wherein the first power value is less than the second power value, and the second power value is less than the third power value.
Fig. 10 shows a circuit diagram of an on-hook indoor unit fan of an air conditioner in an application example, and the circuit comprises: air conditioner major control system, direct current motor M and multichannel sampling circuit, this multichannel sampling circuit includes: the air conditioner main control system comprises a resistor R1, a resistor R2, a MOS transistor Q1 and a MOS transistor Q2, wherein the resistance value of the resistor R2 is larger than that of a resistor R1, S pins (namely sources) of 2 MOS are connected in parallel to an AD sampling port IOin of the air conditioner main control system, G pins (namely gates) of 2 MOS transistors Q1 and Q2 are respectively connected to IO1 and IO2 output pins of the air conditioner main control system.
The specific operation process of the air conditioner master control system is as follows:
1) the air conditioner master control system sets a voltage value Ue of the AD sampling port IOin;
2) when the air conditioner main control system executes a high-wind gear, IO1 and IO2 of the air conditioner main control system output high levels, Q1 and Q2 are conducted, when the fan load is too large, the current Ie flows through R1 and the current of R2 is increased, and based on U ═ R1 × R2/(R1+ R1) × Ie, it can be known that when Ie is large to a certain value, the current U is larger than Ue, the air conditioner main control system executes a current protection action under the high-wind gear, stops the air conditioner from running, and reports the fan fault;
3) when the air conditioner main control system executes a middle wind gear, IO1 of the air conditioner main control system outputs a high level, IO2 outputs a low level, Q1 is switched on, Q2 is switched off, when the fan load is too large, the current Ie is too large, the current flowing through R1 is increased, based on U-R1 Ie, it can be known that when Ie is large to a certain value, the current U is larger than the Ue, the air conditioner main control system executes a current protection action under the middle wind gear, and the fan operates according to the current maximum current fixed output power;
4) when the air conditioner main control system executes the low wind level, the IO1 output low level of air conditioner main control system, IO2 output high level, close Q1, switch on Q2, when the fan load is too big, lead to electric current Ie too big, the electric current that flows through R2 increases, based on U ═ R2 Ie, can learn, when Ie is big to a definite value, then current U can be greater than Ue, then the protection under the wind level was executed to the air conditioner main control system, the fan is according to the operation of the fixed output power of current maximum current.
It can be understood that, in the high wind, the air conditioner master control system gates the resistor R1 and the resistor R2 in the multi-sampling circuit based on the port voltage, in the medium wind, the air conditioner master control system gates the resistor R1 in the multi-sampling circuit based on the port voltage, and in the low wind, the air conditioner master control system gates the resistor R2 in the multi-sampling circuit based on the port voltage. Therefore, based on gating different resistors, the air conditioner master control system can adopt a voltage protection value under different motor powers or rotating speeds, different protection current values can be achieved, the protection value is high in the case of high load, and the protection value is low in the case of low load, so that the mode that the current protection value is fixed is changed, the response of current protection is more timely when a fan fails, and the reliability of motor operation is improved.
In order to implement the method according to the embodiment of the present invention, an embodiment of the present invention further provides a current protection control device for a motor, where the current protection control device for a motor corresponds to the current protection control method for a motor, and each step in the current protection control method for a motor is also completely applicable to the current protection control device for a motor according to the embodiment of the present invention.
As shown in fig. 11, the current protection control apparatus 1100 for a motor includes: the protection method comprises the following steps of obtaining a module 1101, a determining module 1102 and a first protection control module 1103, wherein the obtaining module 1101 is used for obtaining the working current of the motor operation and the rotating speed gear of the motor operation; the determining module 1102 is used for determining a current protection value of the motor based on the rotation speed gear; the first protection control module 1103 is configured to perform protection control on the motor based on a comparison result between the operating current and the current protection value; the motor comprises at least two rotating speed gears, the current protection value is arranged corresponding to the rotating speed gears, and the current protection value is reduced along with the reduction of the rotating speed of the motor.
In some embodiments, the first protection control module 1103 is specifically configured to:
and determining that the working current is greater than or equal to the current protection value, and controlling the output power of the motor to be less than or equal to the set power or controlling the motor to stop running.
In some embodiments, the electric machine includes a first speed gear, a second speed gear and a third speed gear with gradually increasing running speeds, and the current protection value includes: a first current protection value corresponding to the first rotational speed gear, a second current protection value corresponding to the second rotational speed gear, and a third current protection value corresponding to the third rotational speed gear, where the first current protection value is smaller than the second current protection value and the second current protection value is smaller than the third current protection value, and the first protection control module 1103 is specifically configured to:
if the motor runs in the first rotating speed gear, determining that the working current is greater than or equal to the first current protection value, and controlling the output power of the motor not to exceed a first power value; alternatively, the first and second electrodes may be,
if the motor runs in the second rotating speed gear, determining that the working current is greater than or equal to the second current protection value, and controlling the output power of the motor not to exceed a second power value; alternatively, the first and second electrodes may be,
if the motor runs at the third rotating speed gear, determining that the working current is greater than or equal to the third current protection value, and controlling the output power of the motor not to exceed a third power value or controlling the motor to stop running;
wherein the first power value is less than the second power value, and the second power value is less than the third power value.
In practical applications, the obtaining module 1101, the determining module 1102 and the first protection control module 1103 can be implemented by a processor in the current protection control apparatus 1100 of the motor. Of course, the processor needs to run a computer program in memory to implement its functions.
As shown in fig. 12, the current protection control apparatus 1200 of the motor includes: the device comprises a gear control module 1201, a gating module 1202, a sampling module 1203 and a second protection control module 1204, wherein the gear control module 1201 is used for controlling the motor to operate at a specified rotating speed gear; the gating module 1202 is configured to gate the resistance branches of the multi-path sampling circuit based on the rotation speed gear; the sampling module 1203 is configured to obtain a sampling voltage, which is generated by the gated resistance branch and reflects a working current of the motor in the rotation speed gear; the second protection control module 1204 is configured to perform protection control on the motor based on a comparison result between the sampled voltage and a preset voltage protection value; the motor includes two at least rotational speed gears, multichannel sampling circuit includes two at least resistance branch roads, the resistance value of the resistance branch road of gating with the rotational speed gear corresponds, just the resistance value of the resistance branch road of gating is along with the reduction of the rotational speed of motor increases.
In some embodiments, the second protection control module 1204 is specifically configured to:
and determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor to be less than or equal to the set power or controlling the motor to stop running.
In some embodiments, the electric machine includes a first speed gear, a second speed gear and a third speed gear, in which the operating speeds gradually increase, and the resistance value of the gated resistance branch includes: a first resistance value corresponding to the first speed gear, a second resistance value corresponding to the second speed gear, and a third resistance value corresponding to the third speed gear, where the first resistance value is greater than the second resistance value and the second resistance value is greater than the third resistance value, and the second protection control module 1204 is specifically configured to:
if the motor runs in the first speed gear, determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor not to exceed a first power value; alternatively, the first and second electrodes may be,
if the motor runs in the second rotating speed gear, determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor not to exceed a second power value; alternatively, the first and second electrodes may be,
if the motor runs at the third rotating speed gear, determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor not to exceed a third power value or controlling the motor to stop running;
wherein the first power value is less than the second power value, and the second power value is less than the third power value.
In practical applications, the gear control module 1201, the gating module 1202, the sampling module 1203 and the second protection control module 1204 may be implemented by a processor in the current protection control device 1200 of the motor. Of course, the processor needs to run a computer program in memory to implement its functions.
It should be noted that: in the current protection control device for a motor according to the above embodiment, when performing protection control, only the division of the program modules is illustrated, and in practical applications, the above processing may be distributed to different program modules according to needs, that is, the internal structure of the device may be divided into different program modules to complete all or part of the above-described processing. In addition, the current protection control device for the motor and the current protection control method for the motor provided by the above embodiments belong to the same concept, and specific implementation processes thereof are detailed in the method embodiments and are not described herein again.
Based on the hardware implementation of the program module, and in order to implement the method according to the embodiment of the present invention, the embodiment of the present invention further provides a current protection control device for a motor. Fig. 13 shows only an exemplary structure of the current protection control apparatus of the motor, not the entire structure, and a part of or the entire structure shown in fig. 13 may be implemented as necessary.
As shown in fig. 13, a current protection control apparatus 1300 for a motor according to an embodiment of the present invention includes: at least one processor 1301, memory 1302, and a user interface 1303. The various components in the current protection control device 1300 of the motor are coupled together by a bus system 1304. It will be appreciated that the bus system 1304 is used to enable communications among the components. The bus system 1304 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled in fig. 13 as the bus system 1304.
The user interface 1303 in the embodiments of the present invention may include a display, a keyboard, a mouse, a trackball, a click wheel, a button, a touch pad, a touch screen, or the like.
The memory 1302 in the embodiment of the present invention is used to store various types of data to support the operation of the current protection control apparatus of the motor. Examples of such data include: any computer program for operating on a current protection control device of an electric machine.
The current protection control method for the motor disclosed by the embodiment of the invention can be applied to the processor 1301 or can be realized by the processor 1301. Processor 1301 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the current protection control method of the motor may be implemented by an integrated logic circuit of hardware or an instruction in the form of software in the processor 1301. The Processor 1301 described above may be a general purpose Processor, a Digital Signal Processor (DSP), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. Processor 1301 may implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed by the embodiment of the invention can be directly implemented by a hardware decoding processor, or can be implemented by combining hardware and software modules in the decoding processor. The software module may be located in a storage medium located in the memory 1302, and the processor 1301 reads information in the memory 1302, and performs the steps of the current protection control method for the motor provided by the embodiment of the present invention in combination with hardware thereof.
In an exemplary embodiment, the current protection control Device of the motor may be implemented by one or more Application Specific Integrated Circuits (ASICs), DSPs, Programmable Logic Devices (PLDs), Complex Programmable Logic Devices (CPLDs), FPGAs, general purpose processors, controllers, Micro Controllers (MCUs), microprocessors (microprocessors), or other electronic components for performing the aforementioned methods.
It will be appreciated that the memory 1302 can be either volatile memory or nonvolatile memory, and can include both volatile and nonvolatile memory. Among them, the nonvolatile Memory may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a magnetic random access Memory (FRAM), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical disk, or a Compact Disc Read-Only Memory (CD-ROM); the magnetic surface storage may be disk storage or tape storage. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced DRAM), Synchronous Dynamic Random Access Memory (SLDRAM), Direct Memory (DRmb Access), and Random Access Memory (DRAM). The described memory for embodiments of the present invention is intended to comprise, without being limited to, these and any other suitable types of memory.
Illustratively, the current protection control apparatus of the motor further includes: the multi-path sampling circuit comprises at least two resistance branches; the processor includes: the multi-path sampling circuit comprises a gating port and a sampling port used for acquiring the sampling voltage, wherein each resistance branch in the multi-path sampling circuit is respectively arranged corresponding to the gating port and is communicated to the corresponding gating port through a switching tube, and the switching tube determines whether the resistance branch is communicated to the sampling port or not under the control of the gating port.
An embodiment of the present invention further provides an air conditioner, including: a motor and a current protection control apparatus of the motor described in the foregoing embodiments. Here, the motor may be a fan motor, and the current protection control device of the motor may control the fan motor to operate and perform current protection on the fan motor. The air conditioner provided by the embodiment of the invention can effectively improve the response speed of motor current protection under different rotating speed gears, thereby improving the reliability of motor operation.
In an exemplary embodiment, the embodiment of the present invention further provides a storage medium, specifically a computer storage medium, which may be a computer readable storage medium, for example, a memory 1302 storing a computer program, where the computer program is executable by a processor 1301 of a current protection control apparatus of an electric machine to perform the steps described in the method of the embodiment of the present invention. The computer readable storage medium may be a ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface Memory, optical disk, or CD-ROM, among others.
It should be noted that: "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In addition, the technical solutions described in the embodiments of the present invention may be arbitrarily combined without conflict.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (13)
1. A current protection control method of a motor is characterized by comprising the following steps:
acquiring the operating current of the motor;
acquiring a rotating speed gear at which the motor operates;
determining a current protection value of the motor based on the rotation speed gear;
performing protection control on the motor based on a comparison result of the working current and the current protection value;
the motor comprises at least two rotating speed gears, the current protection value is arranged corresponding to the rotating speed gears, and the current protection value is reduced along with the reduction of the rotating speed of the motor.
2. The method of claim 1, wherein the protection controlling the motor based on the comparison of the operating current and the current protection value comprises:
and determining that the working current is greater than or equal to the current protection value, and controlling the output power of the motor to be less than or equal to the set power or controlling the motor to stop running.
3. The method of claim 1, wherein the electric machine includes a first speed stage, a second speed stage, and a third speed stage with progressively increasing operating speeds, and wherein the current protection value comprises: a first current protection value corresponding to the first rotational speed gear, a second current protection value corresponding to the second rotational speed gear, and a third current protection value corresponding to the third rotational speed gear, where the first current protection value is smaller than the second current protection value and the second current protection value is smaller than the third current protection value, and protection control is performed on the motor based on a comparison result between the working current and the current protection value, including:
if the motor runs in the first rotating speed gear, determining that the working current is greater than or equal to the first current protection value, and controlling the output power of the motor not to exceed a first power value; alternatively, the first and second electrodes may be,
if the motor runs in the second rotating speed gear, determining that the working current is greater than or equal to the second current protection value, and controlling the output power of the motor not to exceed a second power value; alternatively, the first and second electrodes may be,
if the motor runs at the third rotating speed gear, determining that the working current is greater than or equal to the third current protection value, and controlling the output power of the motor not to exceed a third power value or controlling the motor to stop running;
wherein the first power value is less than the second power value, and the second power value is less than the third power value.
4. A current protection control method of a motor is characterized by comprising the following steps:
controlling the motor to operate at a specified rotating speed gear;
selecting a resistance branch of a multi-path sampling circuit based on the rotating speed gear;
acquiring sampling voltage which is generated by the gated resistance branch circuit and reflects the working current of the motor at the rotating speed gear;
based on the comparison result of the sampling voltage and a preset voltage protection value, performing protection control on the motor;
the motor comprises at least two rotating speed gears, the multi-path sampling circuit comprises at least two resistance branches, the resistance value of the gated resistance branch corresponds to the rotating speed gears, and the resistance value of the gated resistance branch is increased along with the reduction of the rotating speed of the motor.
5. The method of claim 4, wherein the protection controlling of the motor based on the comparison of the sampled voltage with a preset voltage protection value comprises:
and determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor to be less than or equal to the set power or controlling the motor to stop running.
6. The method of claim 4, wherein the electric machine includes a first speed stage, a second speed stage, and a third speed stage with gradually increasing operating speeds, and the resistance value of the gated resistive branch comprises: with first resistance value that first rotational speed gear corresponds, with second resistance value that second rotational speed gear corresponds and with the third resistance value that third rotational speed gear corresponds, first resistance value is greater than the second resistance value and the second resistance value is greater than the third resistance value, based on the comparison result of sampling voltage and predetermined voltage protection value, right the motor carries out protection control, include:
if the motor runs in the first speed gear, determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor not to exceed a first power value; alternatively, the first and second electrodes may be,
if the motor runs in the second rotating speed gear, determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor not to exceed a second power value; alternatively, the first and second electrodes may be,
if the motor runs at the third rotating speed gear, determining that the sampling voltage is greater than or equal to the voltage protection value, and controlling the output power of the motor not to exceed a third power value or controlling the motor to stop running;
wherein the first power value is less than the second power value, and the second power value is less than the third power value.
7. A current protection control apparatus of a motor, characterized by comprising:
the acquisition module is used for acquiring the working current of the motor and the rotating speed gear of the motor;
the determining module is used for determining a current protection value of the motor based on the rotating speed gear;
the first protection control module is used for carrying out protection control on the motor based on a comparison result of the working current and the current protection value;
the motor comprises at least two rotating speed gears, the current protection value is arranged corresponding to the rotating speed gears, and the current protection value is reduced along with the reduction of the rotating speed of the motor.
8. A current protection control apparatus of a motor, characterized by comprising:
the gear control module is used for controlling the motor to operate at a specified rotating speed gear;
the gating module is used for gating the resistance branches of the multi-path sampling circuit based on the rotating speed gear;
the sampling module is used for acquiring sampling voltage which is generated by the gated resistance branch and reflects the working current of the motor at the rotating speed gear;
the second protection control module is used for carrying out protection control on the motor based on a comparison result of the sampling voltage and a preset voltage protection value;
the motor comprises at least two rotating speed gears, the multi-path sampling circuit comprises at least two resistance branches, the resistance value of the gated resistance branch corresponds to the rotating speed gears, and the resistance value of the gated resistance branch is increased along with the reduction of the rotating speed of the motor.
9. A current protection control apparatus of a motor, characterized by comprising: a processor and a memory for storing a computer program capable of running on the processor, wherein,
the processor, when executing the computer program, is adapted to perform the steps of the method of any of claims 1 to 3.
10. A current protection control apparatus of a motor, characterized by comprising: a processor and a memory for storing a computer program capable of running on the processor, wherein,
the processor, when executing the computer program, is adapted to perform the steps of the method of any of claims 4 to 6.
11. The current protection control apparatus of an electric motor according to claim 10, further comprising:
the multi-path sampling circuit comprises at least two resistance branches;
the processor includes: the multi-path sampling circuit comprises a gating port and a sampling port used for acquiring the sampling voltage, wherein each resistance branch in the multi-path sampling circuit is respectively arranged corresponding to the gating port and is communicated to the corresponding gating port through a switching tube, and the switching tube determines whether the resistance branch is communicated to the sampling port or not under the control of the gating port.
12. An air conditioner, comprising:
a motor; and
a current protection control apparatus of an electric motor according to any one of claims 9 to 11.
13. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the steps of the method of any one of claims 1 to 3 or claims 4 to 6.
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